You should take more pride in the work you produce, even if you say you didn't put any effort into it. That 1st sig looks absolutly terrible for 3 years of practice. Even if you did not put any effort into it the sig, it should at least have basic blending or at least having the background the same shade and colour as the render. I remember reading this in a book, The fastest way to improve is to accept that you suck and then you identify the ways you may improve.